Mechanism of anomalous type electrodeposition of Fe-Ni alloys from sulfate solutions

Hiroaki Nakano; Masayuki Matsuno; Satoshi Oue; Masaaki Yano; Shigeo Kobayashi; Hisaaki Fukushima

doi:10.2320/matertrans.45.3130

Mechanism of anomalous type electrodeposition of Fe-Ni alloys from sulfate solutions

Hiroaki Nakano, Masayuki Matsuno, Satoshi Oue, Masaaki Yano, Shigeo Kobayashi, Hisaaki Fukushima

Material process engineering

Research output: Contribution to journal › Article › peer-review

28 Citations (Scopus)

Abstract

The electrodeposition of Fe-Ni alloys was performed galvanostatically in the sulfate solutions of pH 1-3 at 40°C and the alloy deposition behavior was compared with that of Zn-iron-group metal alloys to investigate their codeposition mechanism. The deposition behavior of Fe-Ni alloy showed a typical feature of the anomalous codeposition, in which electrochemically less noble Fe deposits preferentially under most plating conditions. The anomalous codeposition behavior in Fe-Ni alloy deposition was evidently dependent on the pH buffer capacity of the solutions. This can be explained in terms of the preferential adsorption of FeOH on the deposition sites of more noble Ni due to the extremely smaller dissociation constant of FeOH⁺ than NiOH ^- in the multi-step reduction process of hydrated iron-group metal ions.

Original language	English
Pages (from-to)	3130-3135
Number of pages	6
Journal	Materials Transactions
Volume	45
Issue number	11
DOIs	https://doi.org/10.2320/matertrans.45.3130
Publication status	Published - Nov 2004

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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title = "Mechanism of anomalous type electrodeposition of Fe-Ni alloys from sulfate solutions",

abstract = "The electrodeposition of Fe-Ni alloys was performed galvanostatically in the sulfate solutions of pH 1-3 at 40°C and the alloy deposition behavior was compared with that of Zn-iron-group metal alloys to investigate their codeposition mechanism. The deposition behavior of Fe-Ni alloy showed a typical feature of the anomalous codeposition, in which electrochemically less noble Fe deposits preferentially under most plating conditions. The anomalous codeposition behavior in Fe-Ni alloy deposition was evidently dependent on the pH buffer capacity of the solutions. This can be explained in terms of the preferential adsorption of FeOH on the deposition sites of more noble Ni due to the extremely smaller dissociation constant of FeOH+ than NiOH - in the multi-step reduction process of hydrated iron-group metal ions.",

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T1 - Mechanism of anomalous type electrodeposition of Fe-Ni alloys from sulfate solutions

AU - Nakano, Hiroaki

AU - Matsuno, Masayuki

AU - Oue, Satoshi

AU - Yano, Masaaki

AU - Kobayashi, Shigeo

AU - Fukushima, Hisaaki

PY - 2004/11

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AB - The electrodeposition of Fe-Ni alloys was performed galvanostatically in the sulfate solutions of pH 1-3 at 40°C and the alloy deposition behavior was compared with that of Zn-iron-group metal alloys to investigate their codeposition mechanism. The deposition behavior of Fe-Ni alloy showed a typical feature of the anomalous codeposition, in which electrochemically less noble Fe deposits preferentially under most plating conditions. The anomalous codeposition behavior in Fe-Ni alloy deposition was evidently dependent on the pH buffer capacity of the solutions. This can be explained in terms of the preferential adsorption of FeOH on the deposition sites of more noble Ni due to the extremely smaller dissociation constant of FeOH+ than NiOH - in the multi-step reduction process of hydrated iron-group metal ions.

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